234 Description of a Species of Caligus. 
if we may so call it, there are several folds seen below, (fig. 17,) 
which may be the seat of the sense of taste. Above we observe, 
(fig. 12,) four fleshy oblong organs extending from a point deeply 
situated near the base of the esophagus, obliquely upwards to the 
upper part of the buccal mass. At their lower extremity, they 
are connected by a slender ligament with the bone, g. ‘These 
organs appear to close the esophagus. 'They often open and close 
in consequence of the similar action of the processes, g, with 
which they are connected. 
The articulation of the buccal mass with the surrounding parts 
is formed by means of a bony process situated in it below f, and 
another slender process (h, figs. 12 and 17,) extending backward 
and outward in the adjacent teguments. A curved bony process, 
(i, fig. 13,) connects the projection c (figs. 17, 13,) with the pro- 
cess below f, uniting the two portions of the buccal mass. 
The remaining organs of the cephalic segment consist of four 
pair of feet, corresponding to the second pair of maxilla and the 
three pairs of maxillipeds in the decapodous crustacea. 
The first pair are three-jointed. The basal joint is broad and 
oblong, and is connected with the body by its long posterior side. 
At its inner extremity, which is directed outward nearly parallel 
with the basal, it curves upward and receives the following joint. 
_ The two terminal joints are very different in the two sexes. 
In the male, (fig. 1,) the second joint is large and subconical, 
with an obliquely truncated apex. It appears to be composed of 
two joints, but there is no articulation. The terminal joint is 
obliquely articulated with the preceding; it is small and short, 
and terminates in two strong curved spines, occupying like horns 
the lateral portions of the apex. A slender seta is situated on the 
outer margin, and another on the inner surface near the articula- 
tion. ‘The exterior of the apical spines is often brought in con- 
tact with a prominence on the apex of the preceding joint. In 
the female, (fig. 18 and 18 a,) the second joint is large, but scarcely 
longer than its breadth. The terminal joint gradually tapers with 
an irregular curve to a pointed corneous extremity, which is bent 
downward at right angles with the preceding part. The 
joint is peculiar in having a stout spine directed backwards, on its 
posterior margin. 
Exterior to the outer portion of the basal joint of this leg, there 
is a large hooked spine, arising from a broad base, and having an 
